CN85101068A - Magnetic devices - Google Patents
Magnetic devices Download PDFInfo
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- CN85101068A CN85101068A CN 85101068 CN85101068A CN85101068A CN 85101068 A CN85101068 A CN 85101068A CN 85101068 CN85101068 CN 85101068 CN 85101068 A CN85101068 A CN 85101068A CN 85101068 A CN85101068 A CN 85101068A
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- magnetic
- magnet
- yoke
- magnetic resonance
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Abstract
The invention discloses a magnetic devices, this device includes yoke, is contained in the yoke and forms the magnet of basic uniform magnetic field and be configured in a plurality of magnetic resonance elements in the formed magnetic field of this magnet in this yoke.This magnetic devices also and a plurality of magnetic resonance element opposite faces position on the adjusting device that is used to change the magnetic resistance between yoke and the magnet is installed.
Description
A magnetic devices includes yoke, be contained in the said yoke and in said yoke, form the magnet of basic uniform magnetic field, be configured in the formed magnetic field of said magnet a plurality of magnetic resonance elements and in the adjusting device that is used to change magnetic resistance between said magnetic and the said magnet on the position of said a plurality of magnetic resonance element opposite faces.
The present invention relates to the magnetic resonance element is applied the magnetic devices in magnetic field.
Using as the YIG(yttrium iron garnet) etc. in the filter of prior art of suchlike magnetic resonance element, normally utilize permanent magnet or electromagnet that the magnetic resonance element is applied bias field.At frequency filtering is in the filter of fixing, and why uses permanent magnet to be because its volume is little and consumed energy not in fact.
The filter that is used for prior art is illustrated with reference to Fig. 7 and Fig. 8 the prior art magnetic devices that the magnetic resonance element applies bias field.Reference number 1 among Fig. 7 and Fig. 8 refers to use the yoke of making as soft magnetic materials such as iron.Be formed with on the top of yoke 1 internal thread and be formed with 2 engagements of externally threaded disk in order to regulate magnetic pole gap.Reference number 2 refers to be used for the groove of rotating circular disk 2, and reference number 3 refers to be used for rectangular magnet is contained in fixed head on the bottom surface of disk 2.Discoid permanent magnet 4 and 5 is contained in respectively on the bottom faces of the bottom surface of magnet fixed head 3 and yoke 1.In magnetic 1, HF link plate or sheet are configured in the gap of relative permanent magnet 4 and 5. Reference number 6 and 7 is respectively a pair of being contained on the HF link plate 10 to constitute the laminar magnetic resonance element (YIGs) of two-stage YIG-filter, the input and output side of reference number 8 finger microstrip lines.Reference number 9 refers to topped ground connection conductive layer on HF link plate 10 whole bottom surfaces.
Use such device, when rotating circular disk 2, thereby, just can change the bias field intensity that puts on magnetic resonance element 6 and 7 thus the magnetic field intensity between the relative distance change magnet 4 and 5 of change magnet 4 and magnet 5.Although need apply identical magnetic field intensity so that its resonance frequency is consistent each other to magnetic resonance element 6 and 7.Yet in fact magnet 4 and 5 formed magnetomotive forces are also heterogeneous.Promptly as Fig. 9 and shown in Figure 10, when the diverse location of magnetic resonance element at the HF link plate, its resonance frequency and its residing magnetic field intensity will be respectively change according to certain distributions of magnet 4 and 5 internal structures.In said circumstances, magnet 4 and 5 diameter all are 25 millimeters.
Though through rotary magnet 4 and 5, make magnetic resonance element 6 and 7 identical as far as possible magnetic field intensitys, only can change and regulate the magnetic bias intensity that is applied on magnetic resonance element 6 and 7 by rotating circular disk 2 to reach.
Yet prior art magnetic devices as shown in Figure 7 and Figure 8 has following shortcoming.Here it is, even rotary magnet 4 and 5 wants to make that be applied to bias field intensity on the magnetic resonance element 6 and 7 identical also is unusual difficulty.In addition, when rotating circular disk 2, can change magnet 4 with respect to the depth of parallelism of magnet 5 or make magnet 4 and 5 transversion malpositions take place, so that cause the variation of the filtering performance of filter.
In view of the above, the present invention can provide one can be easily and stably change the magnetic devices of the magnetic field intensity that puts on a plurality of magnetic resonance elements.
Magnetic devices of the present invention comprises a yoke 1, be contained in the yoke 1 and form therein the magnet 4 and 5 of basic uniform magnetic field, be arranged on by a plurality of magnetic resonance elements 6 in magnet 4 and 5 magnetic fields that produced and 7 and the adjusting device 11 and 12 that is used to change and regulate magnetic resistance between yoke 1 magnet 4 relative with a plurality of magnetic resonance elements 6 and 7.
According to the present invention, by adjusting device 11 and 12 change and regulating magnet 4 and yoke 1 between magnetic resistance, thus easily, stably change the magnetic field intensity put on a plurality of magnetic resonance elements 6 and 7.
To see figures.1.and.2 hereinafter according to magnetic devices embodiment of the present invention and to describe in detail.Then being marked with same reference number with Fig. 7 and the corresponding identical part of Fig. 8 among Fig. 1 and Fig. 2 is illustrated.
In Fig. 1 and Fig. 2, reference number 1 refers to yoke and a pair of permanent magnet 4 and 5 that is fixed on the upper and lower of yoke 1 inner surface is arranged.In yoke 1, HF link plate 10 is arranged between magnet 4 and 5. Reference number 6 and 7 refers to be contained on the HF link plate 10 the magnetic resonance element (YIG element) in order to a pair of (or more than 3) laminar (also can be other shape such as sphere etc.) that constitutes the two-stage YIG-filter respectively.Reference marker 8 is input and output sides of microstrip line.
In the magnetic devices as depicted in figs. 1 and 2, magnet 4 and 5 all is fixed, so thereby its gap be constant can be easily and stably change the magnetic field intensity that is applied to magnetic resonance element 6 and 7.Therefore, needn't worry and to produce harmful effect to the high frequency characteristics of HF link plate 10 such as insulation property etc.In addition, when swivel bolt 11 respectively and 12, magnetic resonance element 6 and 7 resonance frequency be independent regulation separately.Thereby have fabulous filtering characteristic and can easily find out the optimum of filtering characteristic.
Use can obtain the excursion of the magnetic field intensity of broad than large diameter bolt 11 and 12.Because magnet 4 and 5 is fixed on the yoke 1, thus the shape of magnet 4 and 5 be not limited only to be discoid and can be desirable a kind of shape, for example rectangular-shaped or the like.Therefore, this magnetic devices is easier to reduced volume.
The test result of the filtering characteristic of this magnetic devices as depicted in figs. 1 and 2 will illustrate.Fig. 3 is that the diameter of bolt 11 and 12 is the characteristic curve of 4 millimeters YIG-filter.Curve a is the characteristic of bolt 11 and 12 when being shed by internal thread 11b and 11c (minimum insert loss be 10dB) among Fig. 3, curve b and c are bolt 11 and 12 one of them characteristic when shedding (minimum insert loss be 26dB), and curve d is the characteristic of bolt 11 and 12 when inserting internal thread 11b and 11c (minimum insert loss be 5dB).By Fig. 3 curve obviously as seen, to d, mid-band frequency can change in the width range of 150MHz by curve a.
Fig. 4 is respectively that bolt 11 and 12 all inserts internal thread 11b and each self-regulation of 11c curve chart when obtaining the optimum filtering characteristic to Fig. 6.Minimum insertion loss is that 3dB and decline 3dB frequency bandwidth are 11.7MHz among Fig. 4, and minimum insertion loss is 2.7dB among Fig. 5, and the frequency bandwidth of decline 3dB is 12.5MHz, and minimum insertion loss is 2.3dB among Fig. 6, and the frequency bandwidth of decline 3dB is 11.0MHz.By Fig. 4 to the curve of Fig. 6 as can be known mid-band frequency can in the scope of 1825MHz, change at 1660MHz.In addition, by regulate filter characteristic reach optimum value can make minimum insert loss by the 5dB before regulating to 10dB(as Fig. 3 curve a to shown in the b) be improved as 2dB to 3dB(such as Fig. 4 to shown in Figure 6).
Magnetic devices of the present invention can also be done following improvement: a pair of magnetic devices and its yoke as depicted in figs. 1 and 2 is set makes shared, HF link plate 10 is clipped in two and goes up in the middle of magnet and two lower magnets, thereby a plurality of paired bolt that disposes with respect to upper and lower magnet is changed by two ends and regulates and changes the magnetic field intensity that puts on a plurality of magnetic resonance elements.In addition, in the magnetic devices illustrated in figures 1 and 2, magnet 5 is movably.
According to the present invention discussed above, can obtain one can be easily and the stably independent magnetic devices that changes each magnetic field intensity that is applied to a plurality of magnetic resonance elements.
Fig. 1 and Fig. 2 are used for profile and the perspective view of diagram according to magnetic devices example of the present invention; By Fig. 3 is respectively the performance diagram of filter to Fig. 6; Fig. 7 and Fig. 8 are respectively the profile and the perspective views of prior art magnetic devices; Fig. 9 and Figure 10 are respectively the distribution character figure of magnetic resonance frequency and magnetic field intensity.
Reference number 1 is a yoke, and 4 and 5 is magnet, and 6 and 7 is magnetic resonance elements, and 11 and 12 is to regulate bolt.
Claims (1)
- A magnetic devices includes yoke, be contained in the said yoke and in this yoke, form the magnet of basic uniform magnetic field, be configured in the formed magnetic field of said magnet a plurality of magnetic resonance elements and and the position of said a plurality of magnetic resonance element opposite faces on be used to change the adjusting device of magnetic resistance between said yoke and the said magnet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85101068 CN85101068A (en) | 1985-04-01 | 1985-04-01 | Magnetic devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85101068 CN85101068A (en) | 1985-04-01 | 1985-04-01 | Magnetic devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN85101068A true CN85101068A (en) | 1987-01-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85101068 Pending CN85101068A (en) | 1985-04-01 | 1985-04-01 | Magnetic devices |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85101068A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102866108A (en) * | 2012-09-03 | 2013-01-09 | 中国矿业大学 | Frictional disk pair test apparatus capable of adjusting magnetic field and method |
-
1985
- 1985-04-01 CN CN 85101068 patent/CN85101068A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102866108A (en) * | 2012-09-03 | 2013-01-09 | 中国矿业大学 | Frictional disk pair test apparatus capable of adjusting magnetic field and method |
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